Single cigarettes bought in Detroit (or any urban area) off of gas station workers. Usually .50 cents each, the logic is that if a worker takes a pack, smokes half and then sells half he makes his $5.00 back that the pack would've cost him.

Also a safer way for gas stations to sell to minors, since the kid can just throw the cigarette on the ground when the po-po rolls by, and not have a pack on him.

a loose cigarette purchased from a store. In NYC they cost 75 cents anywhere that still sells them because anything less and they'd make no money. Illegal but stores in the hood still sometimes carry them. Certain stores even have a codeword for them such as asking for "a piece of candy"

I'm dying for a cigarette but I'm broke. I guess I'll go get a loosie from that bodega.